If you run your business from home and have teenage children using your PC, then your PC is particularly at risk. You've probably got an adult filter setup, but celebrity searchers are also being targeted by virus writers.
Top targets are currently Brad Pitt & Justin Timberlake for the men, and Beyonce and Heidi Montag for women (or vice versa). Cybercriminals attempt to persuade searchers to visit fake sites with the offer of free ring tones or wallpapers. These spammers and virus mongers also use social engineering techniques to persuade users to open emails which contain trojans and the like.
So, educating your users is essential in the online battle to protect your PC from being compromised.